commit b2f5da9dd0 ("rockchip: rk3399: Add Nanopi M4 board support") added
support for Nanopi M4 board with Dual-Channel 4GB LPDDR3-1866 RAM.
This patch adds another variant of NanoPi M4 board with Dual-Channel
2GB DDR3-1866 RAM.
Signed-off-by: Deepak Das <deepakdas.linux@gmail.com>